- Add new wm_gmii_{hv,i82544}_{read,write}reg_locked() and use them in
wm_gmii_{hv,i82544}_{read,write}reg(). *_locked() functions are not
mii(4) API functions, so it's not required to keep the mii API. Change
the PHY register type from int to uint16_t. It also change the usage of
return value. It returns zero on success and non-zero on error.
- Check the return value of *_locked() function and treat it.
- Use *writereg_locked() function to reduce race condition in
wm_init_lcd_from_nvm().
- Add comment.
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